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++MCG-1

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Northstar Polymers, LLC

3444 Dight Avenue So.

Minneapolis, MN 55406

Tel: 612.721.2911

Fax: 612.721.1009

E-Mail: info@northstarpolymers.com

Northstar Polymers, LLC is a member of Polyurethane Manufacturers Association.

Copy right reserved by Northstar Polymers, LLC 2000 - 2007.

MCG-1

OOO Scale Microcellular Gel Elastomer

MCG-1 is formulated for making extremely soft products.  MCG-1 has unique structure for this class of material.  The cured product will be slightly foamed and give a very soft touch, yet faster responding time than the other polyurethane gel of similar hardness range.

Typical polyurethane gel materials have solid range between Shore OO 10 to OO 40 hardness, and if the mixing ratio is modified to obtain a softer range product, the material starts to sag like thick liquid.  MCG-1 has its solid range below Shore OO 1 hardness, or in Shore OOO scale range.  (See below for the hardness data.)  This allows a manufacturer to use the molded part at OOO scale without plastic film or liquid proof fabric.  The cured part can be directly covered with Spandex type fabric; this allows your part to directly convey the softness of the gel.  

Another property that is unique to this gel is that since it contains some bubbles inside, it has a property to contract down from the original volume when a deflection force is applied.  Regular gel materials do not contract within the same space and need expansion space to deflect, thus typically they are not appropriate for upholstery application.  MCG-1 contracts up to a certain point without needing expansion space, thus it can be used as upholstery and bedding applications conveying its softness.

Suggested applications include:

• Cushioning and padding parts for sporting goods and medical devices

• Upholstery application

• Human-fat simulating products (for doll skins, external breast augmentation etc.)

• Pillows and beds

• Shock absorbing products

• Seating products

This polyurethane gel material is formulated in such a way that the user can control/choose the hardness/deflection properties of the product.   Following is reference for the hardness to the corresponding mixing ratio.

Components:

Part-A:                                   MPA-026

Part-B:                                   PAA-033

Mixing Ratio:

               Hardness Range                     Mixing Ratio                         

Shore OOO 37                       A:B = 1:9.0 by weight

Shore OOO 40                       A:B = 1:8.7 by weight

Shore OOO 45                       A:B = 1:8.5 by weight

Shore OOO 49                       A:B = 1:8.0 by weight

Shore OOO 68                       A:B = 1:7.0 by weight

*The above hardness data is typical values and may vary depending on the various processing conditions.  Harder products have faster rebound time and deflection.    The user must calibrate the mixing ratio to the desired yielding hardness for each application. The above data is reference only.

The following is the processing parameters of 1:8.5 mixing ratio, ambient temperature for the component materials and the mold.  Harder material has faster curing pattern in general.

Pot life:                                   2 to 2-1/2 minutes at ambient temperature

Demolding:                            15 – 20 minutes at ambient temperature

Complete Cure:                      24 hours at ambient temperature

                Processing Temperatures:

                Part-A                                    Ambient

                Part-B                                     Ambient

                Mold                                      72 to 110 °F

                Post cure                               Ambient

Part-A material is viscous at a room temperature.  If casting machine is used for high volume production, part-A can be heated up to 160 °F to lower the viscosity; this should help well-mixing of the components. 

Do not heat part-B.  Higher processing temperature may cause excessive shrinkage.   Test the optimum mold temperature for each application.

Part-A component may have a dark settlement at the bottom of the container.  This dark and highly viscous settlement cannot be used in the batch.  If the dark settlement enters the batch, the part may have hard lumps, which are inconsistent in the part.  Use only lighter color top part. 

The cured surface of this material (especially at a low Durometer hardness) is sticky; it is recommended the material is covered with soft fabric or flexible film material.  For temporary handling, you may use talc powder to prevent it from sticking to the handlers or equipment. In case of casting or molding, silicone release agent can be used.

Component Data:

Part-A

Part-B

Handling Information:

Safety:

The component materials are industrial-grade chemicals.  Please keep them in a secure place and prevent access from any unauthorized individual.  The personnel who handle these materials need to read the Material Safety Data Sheet (MSDS) for detail information on safety and handling of the material.  The MSDS for each component is sent with the shipment of the component material. 

When you are conducting a test, or producing your parts using this material, please be sure to operate in a wide-open area with good air movement, or in a well-ventilated area. Wear rubber gloves, long sleeves, and protective eyeglasses to prevent skin/eye contact of the material.  When your operation involves heating or spraying of the material, we recommend, in addition to the above, installation of a proper dynamic ventilation system and/or using a half-face respirator to prevent inhalation of the fume.  

Direct contact of polyurethane raw materials to skin/eye, as well as ingestion may lead to health problems.  No eating or smoking should be permitted at the working area.  The operator should wash hands well with soap and water after handling the materials.  Please refer to the Material Safety Data Sheet for each component for the detailed health information.

Storage:

Part-A component (prepolymer) contains isocyanate component, which is very much sensitive to moisture.  If it is left in air, part-A component will react with atmospheric moisture and will be ruined.  This reaction is non-reversible.  Soon after opening a can and dispensing the content, nitrogen gas or negative-40-degree-due-point dry air needs to be injected to the container to blanket the material.  Silica gel or calcium chloride desiccant filter should be installed to 55 gallon drum-vent for your drum dispensing system.  The storage temperature should be at a room temperature between 65 and 90 ºF.

Part-B component may be hygroscopic.  If the material is exposed to ambient air, it may absorb moisture. Moisture contaminated part-B material may become source of degradation or excessive bubbles in the product.  Avoid exposure of the material to air.  For long term storage, purging the empty space in the container with nitrogen gas or negative-40-degree-due-point dry air is also recommended to prevent moisture contamination of part-B. The storage temperature should be at a room temperature between 65 and 90 ºF.  Store the containers in a dry indoor space.

For any questions, please contact Northstar Polymers.

Tel:          612-721-2911

Fax:          612-721-1009

Web Site:     http://www.northstarpolymers.com

E-Mail:       info@northstarpolymers.com

For any questions, please feel free to contact us:

Northstar Polymers, LLC

3444 Dight Avenue South

Minneapolis, MN 55406

Tel: 612.721.2911

Fax: 612.721.1009

E-Mail: info@northstarpolymers.com

Notice: All of the statements, recommendations, suggestions, and data concerning the subject material are based on our laboratory results, and although we believe the same to be reliable, we expressly do not represent, warrant, or guarantee the accuracy, completeness, or reliability of same, or the material or the results to be obtained from the use thereof, neither do we warrant that any such use, either alone or in combination with other materials, shall be free of the rightful claim of any third party by way of INFRINGEMENT or the like, and NORTHSTAR POLYMERS DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, OF MERCHANTABILITY and FITNESS FOR